Construction-to-Demolition Lifecycle
An Environmentally Conscious Foundation Method from Construction to Demolition
The TNF 2.0 method is an environmentally conscious construction method not only during construction, but also at the time of building removal and reconstruction.
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Environmental Considerations During Construction
Reduction of Excavated Surplus Soil
With conventional pile foundation methods, much of the surplus soil generated during excavation becomes muddy sludge, which must be treated as construction waste.
In contrast, the TNF method produces high-quality improved soil, making it suitable for reuse on site.
Column improvement and pile methods: soil has a sludge-like, viscous consistency
This improved soil can be reused as subfloor fill material or for exterior works, reducing the volume of surplus soil to less than half that of pile foundation methods.
This simultaneously reduces disposal costs and environmental impact.
Reduced CO₂ Emissions Through Shorter Construction Periods
The TNF 2.0 method does not require large-scale construction work like pile foundations and can be executed using standard construction machinery, shortening equipment procurement time.
In addition, concrete can be placed directly on the improved ground with minimal formwork, enabling shorter construction periods.
As a result, CO₂ emissions can be reduced through shortened construction schedules.
Construction Using Standard Machinery
No specialized machinery required, enabling shorter construction periods and lower costs
No Formwork Required
Concrete can be placed directly on the improved ground, reducing the amount of formwork required
No Temporary Work Costs
Temporary working platforms are created during ground improvement, eliminating the need for full-site steel plates
Demolition of the TNF 2.0 Method
Easy Demolition of Improved Ground
With conventional column improvement and pile foundation methods, large-scale work such as pile extraction is required during demolition, and removal costs can reach approximately three times the original construction cost.
In contrast, the TNF method requires work only to a shallow depth of approximately 2–3 meters below ground level, allowing demolition using standard machinery. As a result, removal and demolition costs can be reduced to about half of the original construction cost.
Reduction of Industrial Waste Through Reuse of Excavated Material
The improved ground material generated during demolition can be finely crushed and reused as construction soil.
According to the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) standards for construction-generated soil utilization, soil produced from TNF ground improvement meets or exceeds Class 3 construction soil criteria and can be used as backfill material without additional treatment.
This makes it possible to suppress the generation of industrial waste while reducing environmental impact and achieving high cost performance.
Benefits During Reconstruction
With the TNF method, the improved soil generated during demolition can be reused on site as backfill material, maintaining good ground conditions after demolition.
As a result, the amount of solidifying agents required for ground improvement during reconstruction can be reduced.
In this way, the TNF method is a ground improvement technology that achieves both environmental performance and economic efficiency throughout the entire lifecycle—from construction to demolition and reconstruction.
Demolition Procedure for Improved Ground
Demolition case study
Use: Supermarket
Completion: May 2011
Demolition: October 2019
Crushing of Slab and Improved Ground
The improved ground is broken using an excavator, and large masses are divided into smaller pieces.
Crushing of Large Blocks
A nibbler (lightweight crusher) is used to further break down large blocks.
Crushing to Below the Specified Size
When necessary, a self-propelled jaw crusher is used to crush material to below the specified size.
Backfilling with Demolition-Generated Soil
The finely crushed soil produced through the above steps is reused on site as backfill material.
This maintains favorable ground conditions and reduces ground improvement costs during reconstruction.
In addition, reductions in imported soil and industrial waste volumes contribute to overall cost savings.
